remove dependency on pytz

rest_framework/fields.py

@@ -29,7 +29,6 @@
 from django.utils.formats import localize_input, sanitize_separators
 from django.utils.ipv6 import clean_ipv6_address
 from django.utils.translation import gettext_lazy as _
-from pytz.exceptions import InvalidTimeError
 
 from rest_framework import ISO_8601
 from rest_framework.exceptions import ErrorDetail, ValidationError
@@ -1162,15 +1161,12 @@ def enforce_timezone(self, value):
                     return value.astimezone(field_timezone)
                 except OverflowError:
                     self.fail('overflow')
-            try:
-                dt = timezone.make_aware(value, field_timezone)
-                # When the resulting datetime is a ZoneInfo instance, it won't necessarily
-                # throw given an invalid datetime, so we need to specifically check.
-                if not valid_datetime(dt):
-                    self.fail('make_aware', timezone=field_timezone)
-                return dt
-            except InvalidTimeError:
+            dt = timezone.make_aware(value, field_timezone)
+            # When the resulting datetime is a ZoneInfo instance, it won't necessarily
+            # throw given an invalid datetime, so we need to specifically check.
+            if not valid_datetime(dt):
                 self.fail('make_aware', timezone=field_timezone)
+            return dt
         elif (field_timezone is None) and timezone.is_aware(value):
             return timezone.make_naive(value, datetime.timezone.utc)
         return value

setup.py

@@ -83,7 +83,7 @@ def get_version(package):
     author_email='[email protected]',  # SEE NOTE BELOW (*)
     packages=find_packages(exclude=['tests*']),
     include_package_data=True,
-    install_requires=["django>=3.0", "pytz", 'backports.zoneinfo;python_version<"3.9"'],
+    install_requires=["django>=3.0", 'backports.zoneinfo;python_version<"3.9"'],
     python_requires=">=3.6",
     zip_safe=False,
     classifiers=[

tests/test_fields.py

@@ -9,7 +9,6 @@
 from unittest.mock import patch
 
 import pytest
-import pytz
 from django.core.exceptions import ValidationError as DjangoValidationError
 from django.db.models import IntegerChoices, TextChoices
 from django.http import QueryDict
@@ -1590,31 +1589,6 @@ def test_should_render_date_time_in_default_timezone(self):
         assert rendered_date == rendered_date_in_timezone
 
 
-@pytest.mark.skipif(pytz is None, reason="As Django 4.0 has deprecated pytz, this test should eventually be able to get removed.")
-class TestPytzNaiveDayLightSavingTimeTimeZoneDateTimeField(FieldValues):
-    """
-    Invalid values for `DateTimeField` with datetime in DST shift (non-existing or ambiguous) and timezone with DST.
-    Timezone America/New_York has DST shift from 2017-03-12T02:00:00 to 2017-03-12T03:00:00 and
-     from 2017-11-05T02:00:00 to 2017-11-05T01:00:00 in 2017.
-    """
-    valid_inputs = {}
-    invalid_inputs = {
-        '2017-03-12T02:30:00': ['Invalid datetime for the timezone "America/New_York".'],
-        '2017-11-05T01:30:00': ['Invalid datetime for the timezone "America/New_York".']
-    }
-    outputs = {}
-
-    class MockTimezone(pytz.BaseTzInfo):
-        @staticmethod
-        def localize(value, is_dst):
-            raise pytz.InvalidTimeError()
-
-        def __str__(self):
-            return 'America/New_York'
-
-    field = serializers.DateTimeField(default_timezone=MockTimezone())
-
-
 @patch('rest_framework.utils.timezone.datetime_ambiguous', return_value=True)
 class TestNaiveDayLightSavingTimeTimeZoneDateTimeField(FieldValues):
     """